Adjustable hollow milling-tool.



A..l GEITNER.

ADJUSTABLE HOLLOW MILLING TOOL.

APPLICATION men 056.3. 1917.

1,300, 1 58. Patented Apr. 8, 1919.

4 1 avel Ito:

' Amman L. German, or ama new roux.

' ADJUSTABLE noLLow mnnmmroon.

Toall whom it may concern:

Be it known that I, ALEXANDER. L. Garr- Nnn, a citizen of the United States, residing at Rochester, in the county of Monroe and State of New York, have invented certain new and useful Improvements in Adjustable Hollow Milling-Tools, of which the following is a specification. v

The .ob'ect-of this invention is to provide a new and improved form of a hollow milling tool which can be readily adjusted and in which each of the individual cutting tools may be taken out and reground at will, without disturbing the setting of the others.

This and other objects of this invention will be fully illustrated in the drawings, described in the specification and pointed out in the claims at the end thereof.

In the accompanying drawing,

Figure 1- is a side elevation of the milling tool.

Fig. 2 is an end elevation of the milling tool.

Fig. 3 is a vertical longitudinal section through the millin tool, the section'being taken on the line 3 3X of Fi 2.

Fig. 4 is a cross section throng one of the cutting tools and clamping device therefor, the section being taken on the line 4X--4X of Fig. 3.

- In the several figures of the drawing, like reference numerals indicate like parts.

Reference numeral 1 indicates a hollow shank having a cylindrical head 2 rovided at the front end thereof. In this ead are cut the inclined ofi'set slots 3, 4 and 5 which receive the cuttingtools 6, 7 and 8. The head is also provided with a series of sockets 9, 10 and 11 which are located adjacent to the inclined slots 3, 4: and 5 respectively.

A clamping screw 12 surrounded by a sleeve 13 is inserted into each of the sockets.

9, 10 and 11 and the inclined shoulder 14 provided on each of the sleeves 13 is adapted to engage a portion of the top edge of the tool which is inserted in the slot adjacent to the sleeve and clamping bolt therefor.

The inner extension of each of the sockets 9, 10 and 11 which is reduced in diameter is threaded to receive the threaded end of the clamping sleeve 12. When one of the screws 12 is screwed into its socket, the head 15 thereof engages the'outer end of its sleeve and forces it downwardly. This in turn forces. the over-hanging shoulder rovided on the sleeve against the top edge 0 the cut- Specification of Letters Patent.

- as above Patented Apr. 8, 19 19.

Application filed December 8, 191i. Serial No. 205,207.

v tool "and clamps this tool rigidlyinto the inclined slot.

The "rear end of the cylindricalhead is 1 threaded to receive the adjusting ring 16.

This ring is'threaded on the inside and its front face is preferably dished out at 17 for a purpose that will presently appear. The

cutting tools 6, 7 and 8 are adjusted laterally or angularly by means of the adjusting ring 16in the following manner:

The cutting tools are inserted into the slotsunt'il the rear ends thereof rest against the dished out face of the adjusting ring. The angle at which the ring is dished out preferably corresponds with the angle at which-the rear ends of the tool project upwardly so as to form a uniform bearing against which the tools may abut. After all of the tools are inserted 1n this manner, the-adjusting ring is rotated and screwed forwardly so that the cutting tools are moved forwardly and downwardly along the inclined slots until the edges of the'tools are brought together to the desired position. As soon as this position is reached the clamping screws and sleeves are made to hold the tools rigidly in place on the head ointed out.

The mi ling tool is then ready for cutting and thecutting edge of each of the cutting tools is held parallel with the central axis of the tool and the stock which is to be oper ated upon by the milling tool is inserted between the cutting tools which reduce the diameter of the stock the desired amount.

The finished portion of the stock passes into the hollow portion of the head and shank of the tool and out through the rear thereof if necessary. In this manner any sized stock within the range of the tool may be reduced in diameter with this milling tool by adjusting the cutting tools in their inclined slots for the desired depth of cut as above pointed out.

The front ed e of each of the cutting tools serves to cut t e stock endwise and leaves a finished shoulder on the stock wherever the cutting operation thereon ends and the original diameter of the stock begins.

For this purpose the outer edge of the cutting tool may be made either straight or curved according to the finish which is desired for the shoulder between the reduced and original diameter of the stock.

The cutting tools are sharpened by grinding the side of the tools adjacent to the cutting edge thereof and when it is necessary to resharpen the cutting edge of one of the tools it can be separately taken out from the 'head by releasing its clamping screw, re-

ground and inserted back and clamped to its original position without disturbing the setting of any of the other cutting tools.

It will be seen that the cutter can be very easily adjusted either individually or collectively in the manner above described and the construction of the milling tool as a whole is such that it will operate with a minimum time lost both in setting up or regrinding each of the individual cutting tools. v

I claim:

"1. A milling tool comprising a head having a seat therein,a cutting tool adapted to rest on said seat, a clamping sleeve engaging said tool on two sides thereof to hold it firmly against movement, a clamping screw passing through said sleeve and threaded into said head, said screw being adapted to force said sleeve against said tool and hold it in its seat.

2. A hollow milling tool comprising a circular head, a shank forming an extension at the rear of said head, inclined slots in said head, a pocket adjacent to each of said slots, cutting tools in said slots, a clamping sleeve having a fiat side adjacent to and in contact with the side of each of said cuttin tools, a shoulder on the end of said flat slde, said shoulder overlapping the top of said cutting tools, a clamping screw passing through each of said clamping sleeves, said clamping screws being adapted to force the shoulders on said sleeves against the top edge-of said tools.

3. A hollow milling tool comprising a circular head, a shank forming an extension at the rear of said head, inclined slots in said head, a pocket adjacent to each of said slots, cutting tools in said slots, a clamping sleeve having a fiat side adjacent to and in contact with the side of each of said cutting tools, a shoulder on the end of said fiat side, said shoulder overlapping the top of said cutting tools, a clamping screw passing through, each of said clamping sleeves, said clamping screws being adapted to force the shoulders on said sleeves against the top edge of said tools, an adjusting ring threaded on the rear of said head, said adjusting ring being adapted to form a movable shoulder against which the ends of said tools abut.

4. A milling tool comprising a head, slots in the periphery of said head, cutting tools adapted to rest in said slots, pockets adjacent to said slots, clamping sleeves adapted to engage said pockets, said sleeves having a flat side ad acent to and in contact with said cutting tools, a shoulder on the end of said fiat side, said shoulder overlapping the top of said cutting tools, clamping screws passing through said clamping sleeves and threaded into said head, said clamping screw being adapted to force the shoulder on said sleeves against the top of said cutting tools to hold said cutting tools in place in said slots.

In testimony whereof I afiix my signature in the presence of two witnesses.

ALEXANDER L. GEITNER.

Witnesses:

RALPH R. WEBB,

EDWARD C. GEITNER. 

